libsysutils: SocketListener: handle recv errors more gracefully.

Don't close the socket when onDataAvailable returns false if the socket
is connectionless.

Change-Id: Ie19497f5928144c463d92aa72ba517e675549ea6
diff --git a/libsysutils/src/SocketListener.cpp b/libsysutils/src/SocketListener.cpp
index 69ed79e..fcad624 100644
--- a/libsysutils/src/SocketListener.cpp
+++ b/libsysutils/src/SocketListener.cpp
@@ -213,8 +213,9 @@
             it = pendingList->begin();
             SocketClient* c = *it;
             pendingList->erase(it);
-            /* Process it, if false is returned, remove and destroy it */
-            if (!onDataAvailable(c)) {
+            /* Process it, if false is returned and our sockets are
+             * connection-based, remove and destroy it */
+            if (!onDataAvailable(c) && mListen) {
                 /* Remove the client from our array */
                 pthread_mutex_lock(&mClientsLock);
                 for (it = mClients->begin(); it != mClients->end(); ++it) {